On covert throughput performance of two-way relay covert wireless communications
On covert throughput performance of two-way relay covert wireless communications
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DOI：
10.1007/s11276-020-02256-9
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发表时间：
2020-01
影响因子：
3
通讯作者：
Huihui Wu;Yuanyu Zhang;Xuening Liao;Yulong Shen;Xiaohong Jiang
中科院分区：
文献类型：
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作者：
Huihui Wu;Yuanyu Zhang;Xuening Liao;Yulong Shen;Xiaohong Jiang
隐蔽无线通信通过隐藏信息传输本身的存在来保证信息安全。现有的工作主要集中在一跳无线通信的隐蔽吞吐量的研究，而隐蔽吞吐量的性能限制在重要的双向两跳场景仍然在很大程度上是未知的。作为最重要的贡献，本文第一次研究了这样的性能限制在一个系统中，两个源希望通过一个中继隐蔽地交换信息，以防止被监视者发现，即，试图检测两个源之间通信的存在的恶意节点。作为第二个贡献，本文考虑了各种情况下关于典狱长的先验知识的中继，源/中继的先验知识的典狱长，以及不同的中继模式，然后提出了一个隐蔽性策略，以抵抗典狱长的检测每个场景。作为最后一个贡献，我们推导出了每个场景下系统隐蔽吞吐量的标度律结果，即，两个源可以交换的最大比特数受到对管理员的检测概率的约束。结果表明，该系统的隐蔽吞吐量服从平方根标度律，与中继模式、检测方案、隐蔽策略以及源/中继和看守的先验知识无关.
Covert wireless communication ensures information security by hiding the existence of the information transmission itself. Available works mainly focused on the covert throughput study of one-hop wireless communications, while the performance limit of covert throughput in important two-way two-hop scenarios remains largely unknown. As the most significant contribution, this paper, for the first time, investigates such performance limit in a system where two sources wish to covertly exchange information through a relay against the detection of a warden, i.e., a malicious node that attempts to detect the existence of communication between the two sources. As the second contribution, this paper considers various scenarios regarding the warden’s prior knowledge about the relay, the sources/relay’s prior knowledge about the warden, as well as different relaying patterns, and then proposes a covertness strategy to resist the warden’s detection for each scenario. As the last contribution, we derive the scaling law result for the covert throughput of the system for each scenario, i.e., the maximum number of bits that the two sources can exchange subject to a constraint on the detection probability of the warden. The results in this paper indicate that the covert throughput of the concerned system follows the well-known square root scaling law, which is independent of the relaying patterns, detection schemes, covertness strategies, and prior knowledges of the sources/relay and warden.